In order to study the dynamic characteristics of a CAP1400 nuclear main pump under transient cavitation conditions,the optimization design of blades based on the method of layer constraint was made to ensure the bubbles generated near the back shroud not to develop to the front shroud rapidly and to restrain the development of bubbles only in individual layers. Based on the Reynolds averaged momentum equation and the SST kω turbulence model,the steady and unsteady numerical calculation of the cavitation transient process was carried out by using the software CFX.As a result, the optimal layer constrained blade model and the transient axial force and radial force of the impeller during the cavitation were obtained.The frequency domain characteristics of the axial force and radial force were obtained by the fast Fourier transform of time domain signals.The simulation results show that the hydraulic efficiency of the pump can be improved effectively when the blade is in a small flow condition, while the hydraulic efficiency in the rated condition region is still maintained basically unchanged. The axial force of the impeller, which is affected by the surface pressure difference between the blade working face and back, is pointed to the inlet of the impeller during the transient process of cavitation . The radial force circumferential distribution of the impeller is not affected by the degree of cavitation, but is related to the state of the pump.In the low frequency range,the vibration caused by the radial force is stronger than the axial vibration and becomes more and more significant with the strengthening of cavitation.
朱荣生,蔡峥,王秀礼,卢永刚,陈宗良,付强,钟伟源. 基于层约束叶片的核主泵空化特性与动力学特性研究[J]. 振动与冲击, 2018, 37(10): 35-42.
ZHU Rongsheng CAI Zheng WANG Xiuli LU Yonggang CHEN Zhongliang FU Qiang. Cavitation characteristics and dynamic characteristics of a nuclear main pump based on the layer constraint of blades. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(10): 35-42.
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